Re: [SLUG] RAID 1 to RAID5 with raidreconf

From: Mario Lombardo (mario@alienscience.com)
Date: Wed Oct 13 2004 - 13:46:13 EDT


I was trying to see if anybody here had any success or failure. I realize the
success and achievements of people online. I've read some of the original
author's posts as well. I'm about to jump on raid.mlist or something. I
forget what the newsgroup/list was.

I could try what you mentioned, but I'd have to build a RAID5 array with only
two empty disks. That's all I have to spare (four disks total). I can move
the RAID1 stuff to there and then raidhotadd the third (parity) member. This
sounds weird but not impossible. What do you think?

/mario

On Tuesday 12 October 2004 14:51, steve szmidt wrote:
> On Tuesday 12 October 2004 01:41 pm, Mario Lombardo wrote:
> > I have a SCSI system that boots from /dev/md0 via initrd. When following
> > the raidreconf documentation on shutting /dev/md0:
> >
> > raidstop /dev/md0
> >
> > I lose the ability to run the following:
> >
> > raidreconf -o oldraidtab -n newraidtab -m /dev/md0
> >
> > I've tried to boot with a sysadmin rescue CD with /dev/md0 not running,
> > but it says something about "no available level 1 drivers", but
> > /proc/mdstat reveals it's aware of the personalities of RAID 1 and RAID
> > 5.
> >
> > How should I approach this?
> >
> > /mario
>
> Stop messing with RAID! : )
>
> Well joking aside, it might be more reliable and time efficient to just
> rebuild it fresh as RAID 5, than reconfiguring. (Obvioulsy you have already
> backed up the data.) As the author noted "However: it is very likely that
> there are serious bugs that will destroy your data, possibly even on disks
> not related directly to the array you are re-configuring."
>
> Google reveals that a number of people are having problems reconfiguring on
> both 2.4 and 2.6 kernels.
>
> So instead of loosing time trying to get that to work you could have it up
> and running after a complete rebuild.

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